#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <iostream>//输入输出流文件



int main()
{
    printf("%s\n","helloworld");
    int a = 10;
    double b = 3.14;
    std::cout<<"helloworld"<<" "<<a<<" "<<b<<std::endl;
    //std::endl : 输出结束，打个回车

    scanf("%d",&a);
    std::cin>>a;
    std::cout<<a<<std::endl;

    return 0;
}